Loose inlet to air filter - Toyota Yaris Forums

supmet · 04-24-2009, 04:53 PM

The part I'm referring to is the "air cleaner inlet no.1" in the picture. When I was cleaning my engine bay I noticed that the inlet moved quite a bit when I bumped it, and could easily wiggle around. Its not falling off, but it definitely isn't in there the way it is supposed to be.

I couldn't find anything in the repair manual about how it is installed, except this:

Now, the way it feels, I think its just pressure fitted in to the air box, and vibrations have finally shaken it loose. But the picture looks like one of the screws is supposed to through the filter box AND the inlet. Anybody know?

I'm planning on going the CAI route sooner or later, so I might just epoxy it in place for a short term fix...

supmet · 04-25-2009, 01:11 PM

Well I took the air box apart and looked under the filter. The two screws just hold the box in, and don't touch the inlet. I'm still not sure how the inlet is supposed to be attached. It looks like the end of the inlet tube that goes into the air box expands at the end, and that's all that keeps it attached to the air box. I'm thinking epoxy may be the only way to fix it without buying the whole air filter box assembly

Yaris Hilton · 04-25-2009, 05:15 PM

Won't really hurt anything even if it falls off. It'll just be noisier. That horn is an intake silencer, that resonates with the enclosed volume of the air box to make a Helmholtz resonator the resonant frequency of which doesn't resonate with the intake pulses at the noisier speed ranges of the engine. Same as the air horn sticking out of the round air cleaner on many older carbureted car engines. Pull the air cleaner off of one of those cars sometime, run it briefly and hear how loud it is with the air cleaner off! The air cleaner assembly serves a similar purpose to the exhaust muffler, though the exhaust is louder than the intake noise.

04-24-2009, 04:53 PM	#1
supmet Banned View User's Garage Drives: 2007 4 Door Yaris Join Date: Jan 2009 Location: Southern California Posts: 1,357	Loose inlet to air filter The part I'm referring to is the "air cleaner inlet no.1" in the picture. When I was cleaning my engine bay I noticed that the inlet moved quite a bit when I bumped it, and could easily wiggle around. Its not falling off, but it definitely isn't in there the way it is supposed to be. I couldn't find anything in the repair manual about how it is installed, except this: Now, the way it feels, I think its just pressure fitted in to the air box, and vibrations have finally shaken it loose. But the picture looks like one of the screws is supposed to through the filter box AND the inlet. Anybody know? I'm planning on going the CAI route sooner or later, so I might just epoxy it in place for a short term fix...

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04-25-2009, 01:11 PM	#2
supmet Banned View User's Garage Drives: 2007 4 Door Yaris Join Date: Jan 2009 Location: Southern California Posts: 1,357	Well I took the air box apart and looked under the filter. The two screws just hold the box in, and don't touch the inlet. I'm still not sure how the inlet is supposed to be attached. It looks like the end of the inlet tube that goes into the air box expands at the end, and that's all that keeps it attached to the air box. I'm thinking epoxy may be the only way to fix it without buying the whole air filter box assembly

04-25-2009, 05:15 PM	#3
Yaris Hilton Half a Bubble Off Plumb Drives: 2009 Yaris Sedan Join Date: Mar 2009 Location: Bristol, Tennessee, USA Posts: 1,593	Won't really hurt anything even if it falls off. It'll just be noisier. That horn is an intake silencer, that resonates with the enclosed volume of the air box to make a Helmholtz resonator the resonant frequency of which doesn't resonate with the intake pulses at the noisier speed ranges of the engine. Same as the air horn sticking out of the round air cleaner on many older carbureted car engines. Pull the air cleaner off of one of those cars sometime, run it briefly and hear how loud it is with the air cleaner off! The air cleaner assembly serves a similar purpose to the exhaust muffler, though the exhaust is louder than the intake noise.